Liquid crystal composition, and liquid crystal display element and liquid crystal display comprising same

Abstract

The invention discloses a liquid crystal composition, a liquid crystal display element containing the liquid crystal composition and a liquid crystal display. The liquid crystal composition comprises one or more compounds as shown in a formula I and at least one or more terminal alkene liquid crystal compounds. The liquid crystal composition is a PSVA liquid crystal composition, and is especially suitable for a display or a TV. The liquid crystal composition has good solubility and high polymerization temperature, and when the liquid crystal composition is used in a liquid crystal display element or a liquid crystal display prepared by adopting a PI-less technology, a compact film layer with relatively high temperature reliability can be formed. And # imgabs0 # I is adopted.

Description

Technical Field

[0001] The present invention relates to the field of liquid crystal display technology, and more specifically, to a liquid crystal composition and a liquid crystal display element and a liquid crystal display comprising the liquid crystal composition. Background Art

[0002] As an important display technology, liquid crystal display (LCD) has developed rapidly in recent years with the advancement of display technology and changes in market demand. The application of LED backlight technology has further reduced the energy consumption of LCD displays and made the display effect more outstanding. At the same time, with the maturity of technology, the application scope of LCD screens is also expanding. The LCD screen industry is developing towards higher contrast, high resolution, high refresh rate, low power consumption, flexibility, special-shaped, 3D and other directions. These technological advances not only improve the user experience, but also bring new growth points to the industry.

[0003] PSVA display is the main display mode of TV display, and PSVA display panels have also become the main products of related companies. However, with the continuous development of technology, how to make advantages in technology optimization and cost reduction is an important direction for the future development of panel manufacturers. In commonly used liquid crystal display devices (LCD), there is a layer of thin film material on the color film substrate and the TFT substrate respectively. Its main function is to arrange the liquid crystal molecules in a certain direction, which is called the alignment layer (PI). This alignment layer is mainly divided into friction alignment type and light alignment type. The alignment layer has the characteristics of uniformity, adhesion and stability. However, the alignment layer also has certain disadvantages: 1) The friction alignment type alignment layer is prone to dust particles, static electricity residue, residue, brush marks and other problems during the display process of the liquid crystal display device, which reduces the yield of the liquid crystal display device; 2) Since PI has high polarity and high water absorption, PI is easy to change during storage and transportation, resulting in uneven alignment; 3) PI materials are expensive, and the process of forming a film of PI materials on the liquid crystal display panel is also relatively complicated, thereby increasing the manufacturing cost of the display panel; 4) Since the PI material is usually dissolved in N-methylpyrrolidone (NMP) solvent to make a PI solution, and then the PI solution is used to prepare the alignment layer, the entire process has the disadvantages of high energy consumption, environmental pollution, and easy to cause harm to the human body. How to effectively avoid the above-mentioned problems caused by PI is an important research topic in the current display development.

[0004] With the discovery of research, the newly proposed PI-less technology can save the PI coating process and directly add monomers that can play an alignment role in the liquid crystal to replace the role of PI. However, a good alignment agent needs to meet many necessary conditions: 1) a good alignment effect to ensure that the liquid crystal has a good dark state effect after being dripped into the panel, and can effectively drive the liquid crystal molecules to rotate after power is applied, and no problems such as alignment dark lines will occur; 2) good pre-tilt angle stability; 3) high temperature tolerance; 4) suitable particle size height, etc., to ensure a good display effect. The market for double-sided PI-free is not yet mature, and there are problems such as alignment ability and reliability. The mass-produced one-side has PI and the other side has no PI, so how to truly double-sided PI-free is an urgent problem to be solved now.

[0005] At present, PSVA usually uses AFM (atomic force microscope) to determine the bump height of particles formed after polymerization of polymerizable compounds (RM). In conventional PSVA liquid crystals, the particle size height of RM after polymerization is about 100nm. If the particle size is too high, dark lines or bright spots will appear. If the particle size is too low, the alignment force on the liquid crystal will become weak. If the particle size height range is too wide, the pre-tilt angles at different positions will be inconsistent. Therefore, it is necessary to have a suitable particle size height and a relatively concentrated particle size range. Similarly, in the field of PI-Less, if the bump height of the particles formed by the alignment agent is uneven, dark lines or bright spots will appear, resulting in poor display.

[0006] The polymerization temperature of the alignment agent determines the high temperature tolerance of the liquid crystal. We know that after the LCD panel is assembled into a box, the frame glue will be cured by a high-temperature baking, the purpose is to make the frame glue cure more completely, but at this time the RM and the alignment agent in the liquid crystal cannot react. If they react prematurely, it may form bright spots and may also affect the subsequent normal UV process.

[0007] Therefore, developing a PI-Less technical solution that has good solubility, a higher polymerization temperature, can form a dense film layer, and has high temperature reliability is a technical problem that needs to be solved urgently. Summary of the invention

[0008] Based on this, the object of the present invention is to provide a liquid crystal composition and a liquid crystal display element and a liquid crystal display comprising the liquid crystal composition. The liquid crystal composition is a PSVA liquid crystal composition, which is particularly suitable for a display or a TV; and the liquid crystal composition has good solubility and a high polymerization temperature, and when used in a liquid crystal display element or a liquid crystal display prepared by using PI-less technology, it can form a dense film layer with high temperature reliability.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions: In one aspect, the present invention provides a liquid crystal composition comprising one or more compounds of formula I: Ⅰ; in, , , Represented independently , , , , , , or ,and , , At least one selected from , , , , or ; L 1 ~L 4 Each independently represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms, wherein any one or more unconnected -CH 2 - can be -O-, -S-, -CO-, -CH 2 O-、-OCH 2 -, -COO-, -OOC- or acrylate groups are substituted with O- or S- groups that are not connected to each other, and one or more H atoms may be independently substituted with F or Cl; R 1 represents a hydrogen atom, a chain alkyl group having 1 to 15 carbon atoms, or a cyclic alkyl group having 1 to 15 carbon atoms; Sp 1 、Sp 2 、Sp 3 Each independently represents a single bond or a chain alkyl group having 1 to 10 carbon atoms, wherein any one of -CH 2 - may be substituted with -O-, -S-, -CO-, -CO-O-, -OCO-, -O-CO-O-; P 1 , P 2 each independently represents a polymerizable group; K 1 express ; R 2represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms; n represents 0 or 1; and At least one or more terminal olefin-based liquid crystal compounds.

[0010] Furthermore, the compound represented by Formula I is selected from the group consisting of compounds represented by Formula I-1 to Formula I-4: Ⅰ-1; I-2; I-3; I-4; in, L 4 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms, wherein any one or more unconnected -CH 2 - can be -O-, -S-, -CO-, -CH 2 O-、-OCH 2 -, -COO-, -OOC- or acrylate groups are substituted with O- or S- groups that are not connected to each other, and one or more H atoms may be independently substituted with F or Cl; R 1 represents a hydrogen atom, a chain alkyl group having 1 to 15 carbon atoms, or a cyclic alkyl group having 1 to 15 carbon atoms; Sp 1 、Sp 3 Each independently represents a single bond or a chain alkyl group having 1 to 10 carbon atoms, wherein any one of -CH 2 - may be substituted with -O-, -S-, -CO-, -CO-O-, -OCO-, -O-CO-O-; P 1 , P 2 each independently represents a polymerizable group; R 2 It represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms.

[0011] Furthermore, the polymerizable group is selected from or , where · represents the connection site.

[0012] Furthermore, the liquid crystal composition comprises at least one compound represented by formula I-1.

[0013] Furthermore, in the liquid crystal composition, the mass percentage of the compound represented by formula I is 0.3-1.5wt%.

[0014] Furthermore, in the liquid crystal composition, the mass percentage of the compound represented by formula I is 0.4-1.0wt%.

[0015] Furthermore, the compound represented by formula I is selected from the group consisting of compounds represented by the following formulas I-1-1 to I-4-1: Ⅰ-1-1、 Ⅰ-1-2、 Ⅰ-1-3、 Ⅰ-1-4, Ⅰ-1-5, Ⅰ-2-1、 Ⅰ-3-1、 Ⅰ-4-1.

[0016] Furthermore, the liquid crystal composition contains at least the compound represented by formula I-1-3.

[0017] Furthermore, the terminal olefin liquid crystal compound is selected from the compound represented by the following formula II: II; in, R 2 represents an alkenyl group having 2 to 10 carbon atoms; R 3 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms; m means 1 or 2; , Each independently expresses , , or ; When m represents 2, Can be the same or different each time it occurs.

[0018] Furthermore, in the liquid crystal composition, the mass percentage of the compound represented by Formula II is 25-85wt%.

[0019] Furthermore, in the liquid crystal composition, the mass percentage of the compound represented by Formula II is 25-50wt%.

[0020] Furthermore, the compound represented by formula II is selected from the group consisting of compounds represented by the following formulas II-1 to II-7: Ⅱ-1、 Ⅱ-2、 Ⅱ-3, Ⅱ-4, Ⅱ-5, Ⅱ-6, II-7; in, R 2 represents an alkenyl group having 2 to 10 carbon atoms; R 3 It represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms.

[0021] Furthermore, the liquid crystal composition further comprises one or more compounds represented by formula III: III; in, R 4 , R 5 Each independently represents an alkyl group having 1 to 10 carbon atoms or an alkoxy group having 1 to 10 carbon atoms; X 1 , X 2 , X 3 , X 4 Each independently represents H or F, and X 1 , X 2 , X 3 , X 4 At least two of them represent F.

[0022] Furthermore, the liquid crystal composition further comprises one or more compounds represented by formula IV: IV; in, R 6 , R 7 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms, and R 6 Any one or more unconnected -CH 2 -optionally substituted by cyclopentylene, cyclopentenylene, cyclobutylene or cyclopropylene; X represents -O-, -S- or -CH 2 O-.

[0023] In another aspect, the present invention provides a liquid crystal display element, comprising the liquid crystal composition as described above.

[0024] In another aspect, the present invention provides a liquid crystal display comprising the liquid crystal composition as described above.

[0025] The beneficial effects of the present invention are as follows: The present invention provides a PI-less technology. When panel factories produce liquid crystal display elements or liquid crystal displays, the use of the liquid crystal composition can save the problems caused by the PI process and save the PI cost, achieving the dual effects of cost reduction and green environmental protection. In the liquid crystal composition provided in the present invention, the compound shown in formula I with a specific structure that must contain a heterocyclic structure is added to the liquid crystal compound to achieve the same effect of PI through autonomous alignment. In the preparation process of the device, the compound shown in formula I in the liquid crystal composition can form a dense film layer, effectively preventing the ions of other film layers from penetrating into the liquid crystal and affecting the VHR of the liquid crystal; at the same time, it is matched with a terminal olefin liquid crystal compound that can inhibit the reaction rate of the alignment agent to prevent the risk of broken bright spots caused by too fast UV1 reaction, and at the same time ensure the uniformity of the bump height of the film layer formed after the reaction; the invention also has high temperature reliability, which can avoid the risk of self-polymerization caused by high temperature during the curing of the frame glue. DETAILED DESCRIPTION

[0026] In order to explain the present invention more clearly, the present invention is further described below in conjunction with preferred embodiments. It should be understood by those skilled in the art that the following specific description is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0027] According to a specific embodiment of the present invention, a liquid crystal composition is provided, wherein the liquid crystal composition comprises one or more compounds represented by formula I: Ⅰ; in, , , Represented independently , , , , , , or ,and , , At least one selected from , , , , or ; L 1 ~L 4 Each independently represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms, wherein any one or more unconnected -CH 2 - can be -O-, -S-, -CO-, -CH 2 O-、-OCH 2 -, -COO-, -OOC- or acrylate groups are substituted with O- or S- groups that are not connected to each other, and one or more H atoms may be independently substituted with F or Cl; R 1 represents a hydrogen atom, a chain alkyl group having 1 to 15 carbon atoms, or a cyclic alkyl group having 1 to 15 carbon atoms; Sp 1 、Sp 2 、Sp 3 Each independently represents a single bond or a chain alkyl group having 1 to 10 carbon atoms, wherein any one of -CH 2 - may be substituted with -O-, -S-, -CO-, -CO-O-, -OCO-, -O-CO-O-; P 1 , P 2 each independently represents a polymerizable group; K 1 express ; R 2 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms; n represents 0 or 1; and At least one or more terminal olefin-based liquid crystal compounds.

[0028] In this embodiment, in the liquid crystal composition, the compound represented by Formula I is used in combination with a terminal olefin liquid crystal compound, so that when the liquid crystal composition is used in the preparation of a liquid crystal display device, the film layer formed has excellent bump height stability, alignment ability, good film thickness uniformity, aging resistance, structural stability and a more stable pretilt angle, etc.

[0029] The terminal olefin liquid crystal compound in this embodiment can inhibit the alignment agent from reacting too quickly, thereby avoiding the risk of generating larger particles and forming bright spots due to too fast polymerization. It does not belong to a polymerizable compound (RM).

[0030] Preferably, the polymerizable group is selected from a methacrylate group or an acrylate group.

[0031] In some preferred examples, Sp 2 represents a chain alkyl group having 1 to 10 carbon atoms, any one of which -CH 2 - may be substituted with -O-, -S-, -CO-, -CO-O-, -OCO-, or -O-CO-O-.

[0032] In some specific examples, the polymerizable group in this embodiment is selected from or , where · represents the connection site.

[0033] In some preferred examples, the compound represented by Formula I is selected from the group consisting of compounds represented by Formula I-1 to Formula I-4, Ⅰ-1; I-2; I-3; I-4; in, L 4 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms, wherein any one or more unconnected -CH 2 - can be -O-, -S-, -CO-, -CH 2 O-、-OCH 2 -, -COO-, -OOC- or acrylate groups are substituted with O- or S- groups that are not connected to each other, and one or more H atoms may be independently substituted with F or Cl; R 1 represents a hydrogen atom, a chain alkyl group having 1 to 15 carbon atoms, or a cyclic alkyl group having 1 to 15 carbon atoms; Sp 1 、Sp 3 Each independently represents a single bond or a chain alkyl group having 1 to 10 carbon atoms, wherein any one of -CH 2 - may be substituted with -O-, -S-, -CO-, -CO-O-, -OCO-, -O-CO-O-; P 1 , P 2 each independently represents a polymerizable group; R 2It represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms.

[0034] In some examples, the polymerizable group is selected from or , where · represents the connection site.

[0035] In some preferred examples, the liquid crystal composition comprises at least one compound represented by formula I-1. The compound represented by formula I-1 is combined with a liquid crystal containing an olefin compound, so that the bump stability, alignment ability, uniformity of film thickness, aging resistance, structural stability and pre-tilt angle stability of the formed film layer are better.

[0036] In some preferred examples, the compound represented by formula I is selected from the group consisting of compounds represented by the following formulas I-1-1 to I-4-1: Ⅰ-1-1、 Ⅰ-1-2、 Ⅰ-1-3、 Ⅰ-1-4, Ⅰ-1-5, Ⅰ-2-1、 Ⅰ-3-1、 Ⅰ-4-1.

[0037] In some preferred examples, the liquid crystal composition comprises at least the compound shown in Formula I-1-3. The compound shown in Formula I-1-3 is combined with an olefinic compound liquid crystal to make the formed film layer have better bump stability, alignment ability, film thickness uniformity, aging resistance, structural stability, and pretilt angle stability.

[0038] In some preferred examples, the mass percentage of the compound represented by formula I-1-3 includes but is not limited to 0.3-1.5%, 0.4-1.4%, 0.5-1.2%, etc.

[0039] In this embodiment, the solubility of the compound shown in Formula I in the liquid crystal composition will be slightly different due to the different substituents, but the addition amount of 0.3-1.5wt% by mass in the liquid crystal composition can be achieved. Since the polymer formed by the compound shown in Formula I is to play the insulating role of PI, a certain thickness is necessary, so the compound shown in Formula I must have sufficient solubility and addition amount. In some examples, in the liquid crystal composition, the mass percentage of the compound shown in Formula I includes but is not limited to 0.3-1.5%, 0.4-1.4%, 0.5-1.2%, etc.

[0040] In some preferred examples, the terminal olefin liquid crystal compound is selected from the compound represented by the following formula II: II; in, R 2 represents an alkenyl group having 2 to 10 carbon atoms; R 3 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms; m means 1 or 2; , Each independently expresses , , or ; When m represents 2, Can be the same or different each time it occurs.

[0041] In some examples, the mass percentage of the compound represented by Formula II in the liquid crystal composition is 25-85wt%. In some specific examples, the mass percentage of the compound represented by Formula II in the liquid crystal composition includes but is not limited to 25-60wt%, 25-50wt%, 30-50wt%, 30-40wt%, 40-60wt%, etc.

[0042] In some preferred examples, the compound represented by formula II is selected from the group consisting of compounds represented by the following formulas II-1 to II-7: Ⅱ-1、 Ⅱ-2、 Ⅱ-3, Ⅱ-4, Ⅱ-5, Ⅱ-6, II-7; in, R2 represents an alkenyl group having 2 to 10 carbon atoms; R 3 It represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms.

[0043] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula III, III; in, R 4 , R 5 Each independently represents an alkyl group having 1 to 10 carbon atoms or an alkoxy group having 1 to 10 carbon atoms; X 1 , X 2 , X 3 , X 4 Each independently represents H or F, and X 1 , X 2 , X 3 , X 4 At least two of them represent F.

[0044] In some examples, the mass percentage of the compound represented by Formula III in the liquid crystal composition is 1-15wt%. In some specific examples, the mass percentage of the compound represented by Formula III in the liquid crystal composition includes but is not limited to 1-11wt%, 1-8wt%, 3-12wt%, 3-8wt%, 4-8wt%, etc.

[0045] In some preferred examples, the liquid crystal composition further comprises one or more compounds represented by formula IV, IV; in, R 6 , R 7 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms, and R 6 Any one or more unconnected -CH 2 -optionally substituted by cyclopentylene, cyclopentenylene, cyclobutylene or cyclopropylene; X represents -O-, -S- or -CH 2 O-.

[0046] In some examples, the mass percentage of the compound represented by Formula IV in the liquid crystal composition is 2-12wt%. In some specific examples, the mass percentage of the compound represented by Formula IV in the liquid crystal composition includes but is not limited to 2-8wt%, 2-7wt%, 2-5wt%, 3-8wt%, 4-8wt%, etc.

[0047] In some preferred examples, the compound represented by formula IV is selected from the group consisting of compounds represented by the following formulae IV-1 to IV-14, IV-1. IV-2, IV-3. IV-4, IV-5. IV-6, IV-7, IV-8 IV-9, IV-10, IV-11, IV-12, IV-13, IV-14.

[0048] In some preferred examples, the liquid crystal composition further comprises one or more compounds represented by formula V, V; in, R 8 , R 9 Each independently represents an alkyl group having 1 to 10 carbon atoms or an alkoxy group having 1 to 10 carbon atoms, R 8 Any one or more unconnected -CH 2 -optionally substituted by cyclopentylene, cyclopentenylene, cyclobutylene or cyclopropylene; Z represents a single bond, -CH 2 O-、-CH 2 CH 2 -or-CH=CH; a represents 0, 1 or 2; express , , , or .

[0049] In some examples, the liquid crystal composition further comprises one or more polymerizable compounds. It is understood that the liquid crystal composition of this embodiment may contain polymerizable compounds or may not contain polymerizable compounds, and their presence does not affect the desired effect.

[0050] In some specific examples, the polymerizable compound is selected from the group consisting of compounds represented by the following formulae RM1-RM6, RM1, RM2, RM3, RM4, RM5, RM6.

[0051] The liquid crystal composition provided by the present invention has a low viscosity and a large elastic constant, and can achieve a fast response. At the same time, the alignment agent (the compound shown in Formula I) in the liquid crystal composition has a fast reaction rate, which can greatly shorten the UV2 illumination time and improve production efficiency. The liquid crystal display element or liquid crystal display containing the liquid crystal composition has a wide nematic phase temperature range, can be used in various places, and has high reliability, high resistivity and other properties.

[0052] Unless otherwise specified, the added amounts of the compound represented by formula I, the terminal olefin liquid crystal compound and other additives of the present invention are all added based on the relative mass percentage of the liquid crystal composition.

[0053] In some examples, dopants with various functions may be added to the liquid crystal composition; in the liquid crystal composition, the mass percentage content of the dopant is preferably between 0.01-0.1wt%.

[0054] Exemplarily, the dopant is mainly an antioxidant, a light stabilizer, and the like.

[0055] In some specific examples, the antioxidant is selected from one or more compounds represented by the following structural formulas: , , , ; Here, S represents an integer of 1-10.

[0056] In some examples, the light stabilizer is ; in, S represents an integer of 1-10.

[0057] [Liquid crystal display element or liquid crystal display] Another specific embodiment of the present invention also relates to a liquid crystal display element comprising any one of the above-mentioned liquid crystal compositions; the liquid crystal display element is an active matrix display element or a passive matrix display element.

[0058] In some examples, the liquid crystal display element is preferably an active matrix addressed liquid crystal display element.

[0059] Another specific embodiment of the present invention also relates to a liquid crystal display comprising any one of the above liquid crystal compositions; the liquid crystal display is an active matrix display or a passive matrix display.

[0060] In some examples, the liquid crystal display is preferably an active matrix addressing liquid crystal display. Exemplary active matrix display elements or displays include, but are not limited to, IPS-TFT or FFS-TFT or VA-TFT liquid crystal display elements or other TFT displays, and are particularly suitable for SAVA-TFT mode liquid crystal display elements or liquid crystal displays.

[0061] The liquid crystal display element or liquid crystal display in this embodiment has a fast response speed, good reliability and a good display viewing angle, and is mainly used in SAVA display mode, especially suitable for curved display elements or displays.

[0062] Example In order to explain the present invention more clearly, the present invention is further described below in conjunction with preferred embodiments. It should be understood by those skilled in the art that the following specific description is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0063] In the present invention, the preparation methods are conventional methods unless otherwise specified, the raw materials used can be obtained from public commercial channels unless otherwise specified, the percentages are mass percentages, the temperatures are degrees Celsius (°C), and the specific meanings of other symbols and test conditions are as follows: Cp represents the clearing point of liquid crystal (℃), measured by DSC quantitative method; Δn represents optical anisotropy, Δn=ne-no, where no is the refractive index of ordinary light, ne is the refractive index of extraordinary light, and the test conditions are 25±2℃, 589nm, and Abbe refractometer test; Δε represents dielectric anisotropy, Δε=ε∥-ε⊥, where ε∥ is the dielectric constant parallel to the molecular axis, and ε⊥ is the dielectric constant perpendicular to the molecular axis. The test conditions are 25±0.5℃, 20μm antiparallel box, INSTEC:ALCT-IR1 test; γ1 represents rotational viscosity (mPa·s), the test conditions are 25±0.5℃, 20 μm antiparallel cell, INSTEC: ALCT-IR1 test; K11 is the splay elastic constant, K33 is the bending elastic constant, and the test conditions are: 25°C, INSTEC:ALCT-IR1, 20 μm antiparallel cell; VHR stands for voltage holding ratio (%), and the test conditions are 60±1℃, voltage ±5V, pulse width 10ms, and voltage holding time 1.667ms. The test equipment is TOYO Model6254 LCD performance comprehensive tester; The preparation method of the liquid crystal composition is as follows: each liquid crystal monomer is weighed according to a certain ratio and put into a stainless steel beaker, and the stainless steel beaker containing each liquid crystal monomer is placed on a magnetic stirring instrument to heat and melt. After most of the liquid crystal monomers in the stainless steel beaker are melted, a magnetic rotor is added to the stainless steel beaker, and the mixture is stirred evenly. After cooling to room temperature, the liquid crystal composition is obtained.

[0064] The preparation method of an exemplary liquid crystal display device is as follows: the liquid crystal composition is poured into a test box (without a polyimide alignment layer, the box thickness is 4μm, there is an ITO electrode on the substrate surface, and there is no passivation layer). In order to achieve spontaneous vertical alignment of the liquid crystal molecules, two ultraviolet irradiation processes are required: UV1 and UV2. A 15V voltage is applied to both sides of the test box, and an ultraviolet lamp with a main wavelength of 313nm is used for irradiation. UV1: The irradiation time varies from 30s to 60s, and the irradiation intensity is 0.55mw / cm 2 ; UV2: irradiation time ranges from 10 to 60 minutes, and the irradiation intensity is 0.20 mw / cm 2 After the UV irradiation process, a pre-tilt angle is formed inside the test box, causing the liquid crystal molecules to spontaneously align vertically.

[0065] Bump height test method: Liquid crystal is poured into the test box, and after the UV process reaction is completed, the particle height on the panel surface after the alignment agent reaction is tested by slice cutting. The test equipment model is Park systems NX10.

[0066] Alignment observation method: Liquid crystal is poured into a test box without PI. After the liquid crystal is poured, a polarizer is orthogonally attached to the test box. The test box with the polarizer is placed on the backlight to observe the light leakage of the test box. The alignment effect is divided into three levels: ○The alignment is very good, no light leakage; △The alignment effect is not good, and there is light leakage at the edge; ×No alignment, severe light leakage.

[0067] In the examples, the liquid crystal monomer structure is represented by a code, and the code representation method of the liquid crystal ring structure, end group, and connecting group is shown in Table 1 and Table 2 below.

[0068] Table 1 Corresponding codes of ring structures

[0069] Table 2 Corresponding codes of terminal groups and linking groups

[0070] Example: , its code is CC-Cp-V1; , whose code is PPY-3-O2; , whose code is CPY-2-O2; , its code is CCY-3-O2; , whose code is COY-3-O2; , whose code is CCOY-3-O2; , whose code is CLY-3-O2; , whose code is Sb-CpO-O4; , whose code is Sc-CpO-O4; , whose code is PGP-Cpr1-2.

[0071] The present invention is described below using the following specific embodiments: Composition C Example Composition C1: The formula of the composition and the corresponding properties are shown in Table 3 below.

[0072] Table 3 Formula of composition C1 and corresponding properties

[0073] Composition C2 The formula of the composition and the corresponding properties are shown in Table 4 below.

[0074] It should be noted here that, in composition C2, the mass percentage of each component is relative to the sum of the masses of other raw materials excluding RM2.

[0075] Table 4 Formula of composition C2 and corresponding properties

[0076] Composition C3 The formula of the composition and the corresponding properties are shown in Table 5 below.

[0077] Table 5 Formula of composition C3 and corresponding properties

[0078] Composition C4 The formula of the composition and the corresponding properties are shown in Table 6 below.

[0079] Table 6 Formula of composition C4 and corresponding properties

[0080] Composition C5 The formula of the composition and the corresponding properties are shown in Table 7 below.

[0081] Table 7 Formulation of composition C5 and corresponding properties

[0082] Composition C6 The formula of the composition and the corresponding properties are shown in Table 8 below.

[0083] Table 8 Formula of composition C6 and corresponding properties

[0084] Composition C7 The formula of the composition and the corresponding properties are shown in Table 9 below.

[0085] Table 9 Formulation of composition C7 and corresponding properties

[0086] Composition C8 The formula of the composition and the corresponding properties are shown in Table 10 below.

[0087] Table 10 Formulation of composition C8 and corresponding properties

[0088] Composition C9 The formula of the composition and the corresponding properties are shown in Table 11 below.

[0089] Table 11 Formulation of composition C9 and corresponding properties

[0090] Comparison of alignment agents: DP1 DP2 , DP3 DP4 , DP5 .

[0091] Liquid crystal composition: Examples 1-12 and Comparative Examples 1-12: The compound (alignment agent) represented by formula I was added to each of the above compositions C to form a liquid crystal composition, and the specific formula is shown in Table 12. In Table 12, the mass percentage of the compound represented by formula I is relative to the content of composition C in the liquid crystal composition.

[0092] Table 12 Test data of Examples 1-12 and Comparative Examples 1-12

[0093] The formation of the pretilt angle includes two processes, UV1 and UV2. UV1 irradiation is performed first. The UV1 irradiation time is shorter in order to form the pretilt angle, and the UV2 irradiation time is longer in order to complete the reaction of the unreacted RM or alignment agent.

[0094] The liquid crystal composition was poured into the test piece to test the VHR; the liquid crystal composition was poured into the test piece to test the bump height after polymerization using AFM (atomic force microscope test); the liquid crystal composition was poured into the sample bottle and sent to test the conversion rate of the alignment agent according to the experimental operation.

[0095] According to the embodiments and comparative examples of the present invention, it can be found that the technical solution of the present invention has a good alignment effect and a faster reaction rate, which can improve the production efficiency of the panel and reduce the cost. Comparing the technical solution of the present invention with comparative examples 1, 3, 5-7, and 8-12, it can be seen that the UV2 irradiation time of the technical solution of the present invention is significantly shortened, which can improve the actual production efficiency of the panel factory; compared with comparative example 2, it can be seen that the technical solution of the present invention has a better alignment effect and a shorter UV2 time; compared with comparative example 4, although the technical solution of comparative example 4 also has a shorter UV2 time and a better alignment effect, the pre-tilt angle formed is too large, and there is a risk of broken bright spots. In Comparative Example 1, the particle size formed after the reaction of RM and the alignment agent is relatively small, and the residue of the alignment agent is relatively high; in Comparative Example 2, the particle size range formed after the reaction of the alignment agent is relatively wide, the uniformity of the formed particles is not good, and the residue of the alignment agent is relatively high; in Comparative Examples 3 and 4, the particle size range formed after the reaction of the alignment agent is relatively wide, and the bump height is significantly higher than that of other embodiments, and there is a high risk of broken bright spots. The alignment effect of Comparative Example 5 is not very good, the uniformity of the formed bump height is relatively poor, and the density is worse than that of the liquid crystal composition of the embodiment of the present invention, resulting in a VHR also lower than that of the composition of the embodiment of the present invention. 2 has the same problem as comparative example 5; therefore, in the liquid crystal composition provided in this embodiment, the alignment agent formed by the compound shown in formula I can ensure that the alignment agent forms a dense film layer, effectively preventing ions from other film layers from penetrating into the liquid crystal and affecting the VHR of the liquid crystal; at the same time, the terminal olefin liquid crystal compound in the liquid crystal mixture can inhibit the reaction rate of the alignment agent, ensure the uniformity of the bump height formed after the reaction of the alignment agent, and prevent the risk of broken bright spots caused by too fast UV1 reaction; at the same time, it has higher temperature reliability, avoiding the risk of self-polymerization caused by high temperature during frame glue curing.

[0096] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A liquid crystal composition, characterized in that: The liquid crystal composition comprises one or more compounds represented by formula I: Ⅰ； in, , , Represented independently , , , , , , or ,and , , At least one selected from , , , , or ; L1 to L4 each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms, wherein any one or more unconnected -CH2- groups may be substituted by -O-, -S-, -CO-, -CH2O-, -OCH2-, -COO-, -OOC-, or an acrylate group in the form of O- or S- being unconnected to each other, and one or more H atoms may be independently substituted by F or Cl; R1 represents a hydrogen atom, a chain alkyl group having 1 to 15 carbon atoms, or a cyclic alkyl group having 1 to 15 carbon atoms; Sp1, Sp2, and Sp3 each independently represent a single bond or a chain alkyl group having 1 to 10 carbon atoms, wherein any one of the -CH2- groups may be substituted by -O-, -S-, -CO-, -CO-O-, -OCO-, or -O-CO-O-; P1 and P2 each independently represent a polymerizable group; K1 means ; R2 represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a cyclic alkyl group having 1 to 15 carbon atoms, an alkoxy group having 1 to 15 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms; n represents 0 or 1; and At least one or more terminal olefin-based liquid crystal compounds.

2. The liquid crystal composition according to claim 1, characterized in that: The compound represented by Formula I is selected from the group consisting of compounds represented by Formula I-1 to Formula I-4: Ⅰ-1； Ⅰ-2； Ⅰ-3； Ⅰ-4。 3. The liquid crystal composition according to claim 1 or 2, characterized in that: The polymerizable group is selected from or , wherein · represents a connection site; and / or The liquid crystal composition comprises at least one compound represented by formula I-1; and / or In the liquid crystal composition, the mass percentage of the compound represented by formula I is 0.3-1.5wt%.

4. The liquid crystal composition according to claim 2, characterized in that: The compound represented by formula I is selected from the group consisting of compounds represented by the following formulas I-1-1 to I-4-1: Ⅰ-1-1、 Ⅰ-1-2、 Ⅰ-1-3、 Ⅰ-1-4、 Ⅰ-1-5、 Ⅰ-2-1、 Ⅰ-3-1、 Ⅰ-4-1。 5. The liquid crystal composition according to claim 4, characterized in that: The liquid crystal composition at least comprises the compound represented by formula I-1-3.

6. The liquid crystal composition according to claim 4, characterized in that: The terminal olefin liquid crystal compound is selected from the compound represented by the following formula II: Ⅱ； in, R2 represents an alkenyl group having 2 to 10 carbon atoms; R3 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms; m means 1 or 2; , Each independently expresses , , or ; When m represents 2, Can be the same or different each time it occurs.

7. The liquid crystal composition according to claim 6, characterized in that: In the liquid crystal composition, the mass percentage of the compound represented by formula II is 25-85wt%; or In the liquid crystal composition, the mass percentage of the compound represented by formula II is 25-50wt%.

8. The liquid crystal composition according to claim 7, characterized in that: The compound represented by formula II is selected from the group consisting of compounds represented by the following formulas II-1 to II-7: Ⅱ-1、 Ⅱ-2、 Ⅱ-3、 Ⅱ-4、 Ⅱ-5、 Ⅱ-6、 Ⅱ-7。 9. The liquid crystal composition according to claim 8, characterized in that: The liquid crystal composition further comprises one or more compounds represented by formula III: Ⅲ； in, R4 and R5 each independently represent a chain alkyl group having 1 to 10 carbon atoms or a chain alkoxy group having 1 to 10 carbon atoms; X1, X2, X3, and X4 each independently represent H or F, and at least two of X1, X2, X3, and X4 represent F; and / or The liquid crystal composition further comprises one or more compounds represented by formula IV: Ⅳ； in, R6 and R7 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms or an alkoxy group having 1 to 10 carbon atoms, and any one or more unconnected -CH2- in the group represented by R6 is optionally substituted by cyclopentylene, cyclopentenylene, cyclobutylene or cyclopropylene; X represents -O-, -S- or -CH2O-.

10. A liquid crystal display element, characterized in that: It comprises the liquid crystal composition according to any one of claims 1 to 9.

11. A liquid crystal display, characterized in that: It comprises the liquid crystal composition according to any one of claims 1 to 9.

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